Maybe they need to go back to 'old fashioned' law enforcement - i.e. haul in the suspects for questioning, put out media adverts to urge victims to come forward

Maybe they need to go back to 'old fashioned' law enforcement - i.e. haul in the suspects for questioning, put out media adverts to urge victims to come forward, etc? The example provided is pretty poor: "Enquiries showed that he was contacting these females and offering them drugs in return for sexual favours." - so their enquiries showed that and yet the only evidence that could secure a conviction is supposedly on the phone that law enforcement can't unlock? I call BS.